package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLocak;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.SimpleBeanInfoFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.connection.stream.*;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.Duration;
import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import static javax.management.Query.eq;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
@Resource
private ISeckillVoucherService seckillVoucherService;
//注入id生成器
@Resource
private RedisIdWorker redisIdWorker;
@Resource
private StringRedisTemplate stringRedisTemplate;
@Resource
private RedissonClient redissonClient;


private static final DefaultRedisScript<Long>SECKILL_SCRIPT;
static {
    SECKILL_SCRIPT=new DefaultRedisScript<>();
    SECKILL_SCRIPT.setLocation(new ClassPathResource("seckill.lua"));
    SECKILL_SCRIPT.setResultType(Long.class);
}
//阻塞队列
private static final ExecutorService SECKILL_ORDER_EXECUOR= Executors.newSingleThreadExecutor();
private void init(){
    SECKILL_ORDER_EXECUOR.submit(new VoucherOrderHandler());
}
//获取消息队列信息
    private class VoucherOrderHandler implements Runnable {
    String queueName="stream.orders";
        @Override
        public void run() {
            while (true) {
                try {
                    //获取获取消息队列信息XREAGROUP GROUP g1 c1 COUNT 1 BLOUK 2000 STREANS  streams.order
                    List<MapRecord<String, Object, Object>> list = stringRedisTemplate.opsForStream().read(
                            Consumer.from("g1", "c1"),
                            StreamReadOptions.empty().count(1).block(Duration.ofSeconds(2)),
                            StreamOffset.create(queueName, ReadOffset.lastConsumed())
                    );

                    //判断消息获取是否成功
                    if (list == null || list.isEmpty()) {
                        //获取失败没有消息，继续下一次循环
                        continue;
                    }
                    //解析订单信息
                    MapRecord<String, Object, Object> record = list.get(0);
                    Map<Object, Object> values = record.getValue();
                    VoucherOrder voucherOrder = BeanUtil.fillBeanWithMap(values, new VoucherOrder(), true);
                    //获取成功继续 可以下单
                    handleVoucherOrder(voucherOrder);
                    //ACK确认
                    stringRedisTemplate.opsForStream().acknowledge(queueName, "g1", record.getId());

                } catch (Exception e) {
                    log.info("处理订单异常");
                    handlePeadingList();
                }
             }
            }


            private void handlePeadingList () {
                while (true) {
                    try {
                        //获取获取pending-list中的信息XREAGROUP GROUP g1 c1 COUNT 1  STREANS  streams.order 0
                        List<MapRecord<String, Object, Object>> list = stringRedisTemplate.opsForStream().read(
                                Consumer.from("g1", "c1"),
                                StreamReadOptions.empty().count(1),
                                StreamOffset.create(queueName, ReadOffset.from("0"))
                        );
                        //判断消息获取是否成功
                        if (list == null || list.isEmpty()) {
                            //获取失败没有消息，说明pending-list中没有异常信息
                            break;
                        }
                        //解析订单信息
                        MapRecord<String, Object, Object> record = list.get(0);
                        Map<Object, Object> values = record.getValue();
                        VoucherOrder voucherOrder = BeanUtil.fillBeanWithMap(values, new VoucherOrder(), true);
                        //获取成功继续 可以下单
                        handleVoucherOrder(voucherOrder);
                        //ACK确认
                        stringRedisTemplate.opsForStream().acknowledge(queueName, "g1", record.getId());

                    } catch (Exception e) {
                        log.info("处理pending-list异常");
                    }
                }

            }

//private BlockingQueue<VoucherOrder>orderTasks=new ArrayBlockingQueue<>(1024*1024);

/*private class VoucherOrderHandler implements Runnable {
    @Override
    public void run() {
        while (true) {
            //获取队列里的元素
            try {
                VoucherOrder voucherOrder = orderTasks.take();
                //创建订单
                handleVoucherOrder(voucherOrder);
            } catch (Exception e) {
                log.info("处理订单异常");
            }

        }
    }*/
}

    private void handleVoucherOrder(VoucherOrder voucherOrder) {
    //获取用户
        Long userId= voucherOrder.getUserId();
        //创建锁对象
        //  SimpleRedisLocak lock = new SimpleRedisLocak("order:" + userId, stringRedisTemplate);
        RLock lock = redissonClient.getLock("lock:order:" + userId);

        //获取锁
        // boolean isLock= lock.tryLock(1200);
        boolean isLock = lock.tryLock();

        //判断是否获取锁成功
        if (!isLock) {
            log.info("订单异常");
            return ;
        }
        try {
 proxy.createVoucherOrder(voucherOrder);
        } finally {
            //释放锁
            lock.unlock();
        }


    }


private IVoucherOrderService proxy;
    @Override
    public Result seckillVoucher(Long voucherId) {
    //获取用户
        Long userId=UserHolder.getUser().getId();
        //获取订单id
        Long orderId=redisIdWorker.nextId("order");
        //执行lua脚本
   Long result=stringRedisTemplate.execute(
                SECKILL_SCRIPT,
                Collections.emptyList(),
                voucherId.toString(),userId.toString(),String.valueOf(orderId)
        );
        //判断结果是为0
        int r = result.intValue();
      if(r!=0) {
    //不为0没有购买资格
    return Result.fail(r==1?"库存不足":"不能重复下单");
}

      /*  //为0有购买资格
        //创建订单
        VoucherOrder voucherOrder=new VoucherOrder();
        //订单id
        long orderId = redisIdWorker.nextId("order");
        voucherOrder.setId(orderId);
        //用户id
        long userid= UserHolder.getUser().getId();
        voucherOrder.setUserId(userid);
        //代金劵id
        voucherOrder.setVoucherId(voucherId);
        //放入阻塞队列
                   orderTasks.add(voucherOrder);*/
                   //获取代理对象
         proxy=(IVoucherOrderService) AopContext.currentProxy();
                   //返回订单ID
             return Result.ok(orderId);
           }



    @Transactional
    @Override
    public void createVoucherOrder(VoucherOrder voucherOrder){
        //一人一单
        Long userId=UserHolder.getUser().getId();
        //查询订单
        int count= Math.toIntExact(query().eq("user_id", userId).eq("voucher_id", voucherOrder).count());
        //判断是否存在
        if(count>0){
            log.info("用户已经个买一次");
            return;
        }
        boolean success=seckillVoucherService.update()
                        .setSql("stock=stock-1")
                                .eq("voucher_id",voucherOrder.getVoucherId()).gt("stock",0)
                        .update();
        if(!success){
           log.error("库存不足");
           return;
        }
//创建订单
        save(voucherOrder);

    }






    //@Override
//@Transactional
    /*public Result seckillVoucher(Long voucherId) {
        //查询优惠卷
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        //判断秒杀是否开始
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀尚未开始");
        }
        if (voucher.getBeginTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已经结束");
        }
        //判断库存是否充足
        if (voucher.getStock() < 1) {
            //库存不足
            return Result.fail("库存不足");
        }
        //扣减库存
        boolean success = seckillVoucherService.update().setSql("stock=stock-1")//stock=stock-1;
                .eq("voucher_id", voucherId)
                .gt("stock", voucher.getStock())//where id=?and stock=?;
                .update();
        if (!success) {
            return Result.fail("库存不足");
        }
        Long userId = UserHolder.getUser().getId();
      //  synchronized (userId.toString().intern()) {
            //获取事务的代理对象
        //创建锁对象
      //  SimpleRedisLocak lock = new SimpleRedisLocak("order:" + userId, stringRedisTemplate);
     RLock lock=  redissonClient.getLock("lock:order:"+userId);

        //获取锁
       // boolean isLock= lock.tryLock(1200);
       boolean isLock=lock.tryLock();

        //判断是否获取锁成功
        if(!isLock){
            return Result.fail("不允许重复下单");
        }
try {
    IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
    return proxy.createVoucherOrder(voucherId);
}finally {
    //释放锁
    lock.unlock();
}
      //  }
    }*/
        /*@Transactional
        public Result createVoucherOrder(Long voucherId){
        //一人一单
        Long userId=UserHolder.getUser().getId();
        //查询订单
 int count= Math.toIntExact(query().eq("user_id", userId).eq("voucher_id", voucherId).count());
        //判断是否存在
        if(count>0){
            return Result.fail("用户已经购买过一次了");
        }

        //创建订单
        VoucherOrder voucherOrder=new VoucherOrder();
        //订单id
    long orderid = redisIdWorker.nextId("order");
    voucherOrder.setId(orderid);
    //用户id
    long userid= UserHolder.getUser().getId();
    voucherOrder.setUserId(userid);
        //代金劵id
    voucherOrder.setVoucherId(voucherId);
    save(voucherOrder);
        //返回订单ID
        return Result.ok(orderid);

    }*/
}
